Visible-Light-Induced Regioselective Alkylation of Coumarins via Decarboxylative Coupling with <i>N</i>-Hydroxyphthalimide Esters
作者:Can Jin、Zhiyang Yan、Bin Sun、Jin Yang
DOI:10.1021/acs.orglett.9b00327
日期:2019.4.5
An efficient photocatalytic decarboxylative 3-position alkylation of coumarins by using alkyl N-hydroxyphthalimide esters as alkylationreagents has been developed. A variety of NHP esters derived from aliphatic carboxylicacids (primary, secondary, and tertiary) has been proved to be tolerated for this decarboxylation process, affording a broad scope of 3-alkylated coumarin derivatives in moderate
A facile iron-catalyzed decarboxylative radical coupling of alkyl diacyl peroxides with coumarins or chromones has been developed, affording a highly efficient approach to synthesize a variety of α-alkylated coumarins and β-alkylated chromones. The reaction proceeded smoothly without adding any ligand or additive and provided the corresponding products containing a wide scope of functional groups in
method for selective C-3 alkylation of coumarinsusing carboxylic acids as alkyl sources is reported. This process offers a practical method for the facile construction of 3-alkyl coumarins with a broad substrate scope. The reaction works under metal-free and aqueous media and both cyclic and acyclic aliphatic carboxylic acids participate in this radical C–C cross coupling reaction.